Palmary UCG-500

Manual cylindrical grinders require an operator to control all axes manually — infeed rate, table traverse, depth of cut — using handwheels. CNC cylindrical grinding automates all axis movements via programmed cycles: the operator sets up the workpiece, enters the program, and the machine executes roughing, semi-finishing, finishing, and spark-out passes automatically. CNC grinding improves part-to-part consistency, enables lights-out production, and reduces operator skill requirements for basic grinding operations. Complex programs (multiple diameters, tapers, shoulders) are dramatically easier to produce reliably on CNC than manual machines.

Universal cylindrical grinding uses two primary workholding methods: between centers (a center in the headstock and tailstock supports the workpiece on its center holes) and chuck workholding (a three-jaw chuck or collet chuck grips the workpiece). Between-center grinding is preferred for shafts because it provides the most accurate reference — the centers define the workpiece axis regardless of outside diameter variation. Chuck workholding is used for workpieces without center holes (short components, small-batch parts). The UCG-500 supports both; the workhead spindle accepts both a center and a chuck.

For general steel shaft OD grinding (carbon steel, alloy steel, 30–55 HRC): Aluminum oxide wheel, 46–60 grit, J–K hardness grade (medium-soft bond), ceramic bond or vitrified bond. For hardened tool steel (55–65 HRC): CBN (cubic boron nitride) superabrasive wheel or aluminum oxide 46 grit, I hardness. For finishing to Ra 0.20 µm: follow the roughing pass with an 80–120 grit aluminum oxide wheel at reduced infeed. Specific wheel recommendations depend on the material, hardness, and required finish — wheel suppliers (Saint-Gobain, 3M, Noritake) can provide application-specific recommendations.

Yes. The UCG-500 can grind tapers using two methods: (1) wheelhead swivel: the wheelhead is swiveled to the taper half-angle and the workpiece is traversed past the wheel, producing a conical surface; (2) table swivel (if equipped): the table swivels to the taper angle. For short, steep tapers (Morse, Jacobs, ISO tapers) the wheelhead swivel method is standard. CNC taper grinding programs use the swivel angle and feed rate to produce consistent taper angle and diameter — more repeatable than manual taper setups.

Palmary Machinery has operated since 1975 and exports to over 60 countries, with an established reputation in the Taiwanese machine tool industry for reliable, serviceable cylindrical grinding machines. They maintain parts inventories for machines going back many years. In North America, Palmary works through authorized distributors who stock common wear parts. The machine's Fanuc control is independently supported by Fanuc service worldwide, separating control reliability from the machine manufacturer's support network. For shops concerned about long-term support, the Fanuc control choice is an important risk mitigator.